Mailing envelope



FIG. 1 is a front perspective view of a mailing envelope showing my newdesign;

FIG. 2 is a rear elevational view thereof.

FIG. 3 is a rear view thereof showing the flap in an open position.

FIG. 4 is a top plan view thereof showing the flap in an open position.

The ornamental design for a mailing envelope, substantially as shown anddescribed.